1. Investigate the activities of CXCR4/CXCR7 in response to their modulators in cell proliferation/differentiation.

2. Investigate CXCR4-mediated cell migration to characterize partners and the impact of CXCR7.

3. Investigate the effect of CXCR4 and CXCR7 activities on tumour angiogenesis.

Methodology:The aim is to characterize the role of CXCR4 partners and the impact of CXCR7, in the CXCL12-driven migration (chemotaxis and haptotaxis), proliferation, differentiation and angiogenesis notably in the context of experimental models for oncogenic human papillomavirus (HPV) (e.g. in vitro in wound healing assays and 3D epithelial models and in vivo in mice models; xenograft and transgenic). In these models, partners-expression will be altered via silencing and CRISPR/Cas9 methods and the impact of CXCR4 or CXCR7 mutants as well their modulators will be analysed. Analyses will be extended to biopsies (paired skin/blood samples) from immunodeficient patients suffering from severe HPV pathogenesis (dysplasia, cancer) by mass cytometry [CyTOF permitting multiparametric analyses of rare populations] to validate the oncosignalling pathways.